Add integration tests (#86)

close #82
close #32

make sure we dont get regressions again ... as we currently have in **main**

followups:
 - create a DNS subdomayn specific to redirect to mock url ...

Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/86
Reviewed-by: crapStone <crapstone@noreply.codeberg.org>

integration/main_test.go

@@ -0,0 +1,62 @@
+//go:build integration
+// +build integration
+
+package integration
+
+import (
+	"context"
+	"os"
+	"testing"
+	"time"
+
+	"codeberg.org/codeberg/pages/cmd"
+
+	"github.com/rs/zerolog/log"
+	"github.com/urfave/cli/v2"
+)
+
+func TestMain(m *testing.M) {
+	log.Printf("=== TestMain: START Server ==\n")
+	serverCtx, serverCancel := context.WithCancel(context.Background())
+	if err := startServer(serverCtx); err != nil {
+		log.Fatal().Msgf("could not start server: %v", err)
+	}
+	defer func() {
+		serverCancel()
+		log.Printf("=== TestMain: Server STOPED ==\n")
+	}()
+
+	time.Sleep(20 * time.Second)
+
+	os.Exit(m.Run())
+}
+
+func startServer(ctx context.Context) error {
+	args := []string{
+		"--verbose",
+		"--acme-accept-terms", "true",
+	}
+	setEnvIfNotSet("ACME_API", "https://acme.mock.directory")
+	setEnvIfNotSet("PAGES_DOMAIN", "localhost.mock.directory")
+	setEnvIfNotSet("RAW_DOMAIN", "raw.localhost.mock.directory")
+	setEnvIfNotSet("PORT", "4430")
+
+	app := cli.NewApp()
+	app.Name = "pages-server"
+	app.Action = cmd.Serve
+	app.Flags = cmd.ServeFlags
+
+	go func() {
+		if err := app.RunContext(ctx, args); err != nil {
+			log.Fatal().Msgf("run server error: %v", err)
+		}
+	}()
+
+	return nil
+}
+
+func setEnvIfNotSet(key, value string) {
+	if _, set := os.LookupEnv(key); !set {
+		os.Setenv(key, value)
+	}
+}